Likelihood analysis of the pMSSM11 in light of LHC 13-TeV data

We use MasterCode to perform a frequentist analysis of the constraints on a phenomenological MSSM model with 11 parameters, the pMSSM11, including constraints from ∝ 36/fb of LHC data at 13 TeV and PICO, XENON1T and PandaX-II searches for dark matter scattering, as well as previous accelerator and astrophysical measurements, presenting fits both with and without the (g-2)μ constraint. The pMSSM11 is specified by the following parameters: 3 gaugino masses M_1,2,3, a common mass for the first-and second-generation squarks m_q and a distinct third-generation squark mass m_q3, a common mass for the first-and second-generation sleptons m_l and a distinct third-generation slepton mass m_τ, a common trilinear mixing parameter A, the Higgs mixing parameter μ, the pseudoscalar Higgs mass M_A and tan β. In the fit including (g-2)_μ, a Bino-like χ⁰₁ is preferred, whereas a Higgsino-like χ⁰₁ is favoured when the (g-2)μ constraint is dropped. We identify the mechanisms that operate in different regions of the pMSSM11 parameter space to bring the relic density of the lightest neutralino, χ⁰₁, into the range indicated by cosmological data. In the fit including (g-2)μ, coannihilations with χ⁰₂ and the Wino-like χ^±₁ or with nearly-degenerate first- and second-generation sleptons are favoured, whereas coannihilations with the χ⁰₂ and the Higgsino-like χ^±₁ or with first- and second-generation squarks may be important when the (g - 2)μ constraint is dropped. Prospects remain for discovering strongly-interacting sparticles at the LHC as well as for discovering electroweakly-interacting sparticles at a future linear e⁺e^- collider such as the ILC or CLIC.